Sanitary drainage system

ABSTRACT

A novel and improved sanitary drainage system is provided wherein the septic tank of the system is fabricated from Fiberglas which has advantages over the use of pre-cast concrete or other material heretofore used in that it is non-corrosive, impervious and light and strong with some flexibility. The Fiberglas septic tank has a generally hemi-spherical, furstoconical or polygonal shape.

Juile 18, 1974 B, ARLSON ETAL 3,817,864

SANITARY DRAINAGE SYSTEM Filed June 2, 1972 United States Patent OfficePM... J... .8, 197.

3,817,864 1 SANITARY DRAINAGE SYSI'EM Henry B. Carlson, Kings Park, andJohn R. Pinezich, Northport, N.Y., assignors to Andrew Carlson 8: Sons,Inc., Kings Park, NY;

. Filed June 2, 1972, Ser. No. 259,277

Int. Cl. Bold 21/10 US. Cl. 210-170 Claims ABSTRACT OF THE DISCLOSUREBACKGROUND OF THE INVENTION In co-pending application Ser. No. 240,138filed Mar. 31, 1972 a novel septic tank construction has been describedwhich, however, while not limited to the use of precast concrete ispreferably made of that material and has a generally toroidal or othershape which may be varied in accordance with requirements of fabricationand installation. The contents of said copending application are herebymade a part hereof.

THE PRESENT INVENTION According to the present invention it has beendiscovered that by making the septic tank of the sanitary drainagesystem of Fiberglas and with a generally hemispherical, frusto-conicalor polygonal shape important and unexpected advantages accrue. Theentire installation is furthermore simplified with respect to itsfabrication, assembly and installation.

In the accompanying drawing,

FIG. 1 is a vertical medial section taken through the new sanitarydrainage system; and

FIG. 2 is essentially a top plan view of FIG. 1 with certain upper partsremoved or broken away to show the underlying construction.

Referring to the drawing, numeral 10 represents the leaching pool whichis made up essentially of a series of super-imposed pre-cast concretedrain rings 12 which are of generally trapezoidal cross-section andwhich thereby provide exit spaces 13 for eflluent which seeps into thesurrounding earth, it being understood that normally the entireinstallation is underground below ground level 11 and its location isreadily ascertainable by the marker M. It is understood, however, thatwhile pre-cast concrete drain rings are illustrated, the invention isnot limited thereto since other materials can be substituted.

The uppermost ring 14 constitutes the top of the leaching pool proper,it being understood that while the leaching pool is usually round (orcircular, it can be rectangular or polygonal if desired, and restingthereon is a dome 15 which like the rings 12 and 14 is made of pre-castconcrete or other suitable material and terminates at its upper end inan opening 16 which is closed by a removable slab or cover 17 also madeof precast concrete or other suitable material. It will be seen that thedome 15 is of a generally frustoconical crosssection when viewedvertically and is of course round when the leaching pool wall is roundor of other shape when the leaching pool wall is non-circular. An inletpipe 18 extends through the dome 15 as illustrated and discharges sewageor other waste material into the Fiberglas septic tank designated by thenumeral 19 above the liquid level L therein and on one side of baflleplate 20 which is provided with bafiie openings 21' for purposes ofcirculation similar to the like openings 25 in FIG. 1 of the aforesaidco-pending application. The path of circulation is shown by thedirectional flow arrows in FIG. 2.

A particularly important and novel feature of the present inventionresides in the septic tank 19 and its fabrication from Fiberglas.Fiberglas is a known material which is widely available commercially andwhich has a variety of uses and it is understood that the Fiberglas ofthe septic tank is made of the standard known and available material. Itis, however, necessary to fabricate the Fiberglas septic tank 19 from aplurality of segments in order to give it the particular shapeillustrated or other shape wherein the lower portion of the tank 19 isgenerally hemi-spherical or has a somewhat flattened polygonal shapedepending on the specific nature of the individual segments and is of amodified toroidal shape in that it surrounds the access shaft 21 whichserves as downflow for sewage or other waste material leading from theinterior of the septic tank to the leaching pool. The access shaft 21 isof generally tubular or circular nature, but is not restricted to suchshape and it is provided with a removable inner cover 22 or a coverwhich is fastened, which is hinged or secured for opening in the mannerof a garbage can cover of Fiberglas, sheet plastic or othernon-corrosive material. In addition it will be observed that accessshaft 21 is in vertical alignment with dome opening 16 so that when slab17 is removed, there is ready access to inner cover 22 and (upon removalor pivotal movement thereof) to the interior of access shaft 21 forobservation or cleaning or other usual purpose. It will still further beobserved that access shaft 21 has an opening 23 in its wall 24 wherebythe material in tank 19 is permitted or caused to move upwardly in theshort vertical tubular member 25 from which it exits as shown by arrowat 26 and flows downwardly through the access shaft 21 into the leachingpool 10 whereupon the treated sewage or other waste material passes outthrough efliuent openings 13 into the surrounding earth.

The Fiberglas tank 19 can be fabricated in any suitable or known manneras by casting or molding operations or by forming sections which arethereafter bolted or otherwise secured together in a water-tightfashion. The material is light, strong and advantageously somewhatflexible while being non-corrosive and superior to pre-cast concrete orother materials heretofore employed in the manufacture of septic tanks.It will also be appreciated, as stated in the aforesaid co-pendingapplication, that the leaching pool and the septic tank may be made ofvarious sizes and capacities which are in general governed by localordinance or regulation. The septic tank may be held easily within theleaching pool in the position shown in FIG. 1 in any desired manner suchas by means of the lateral tab or extension 27 held between uppermostring 14 and the lowermost surface of dome 15 and as will be furtherobserved the Fiberglas baffle plate 20 which extends upward along theinner dome surface is constructed with a flexible flange 28 which servesas a gasket between the baffle plate and the dome.

It is to be understood that the invention includes septic tanks ofvarious shapes, as referred to above, andthat instead of the curvedseptic tank wall shown in FIG. 1 a straight wall can also be employedwherein the tank is in effect frusto-conical with the wall extending ina direct substantially straight line from member 27 to the bottom ofaccess shaft 21. In actuality, due to fabrication methods, the shape ofthe tank 19 is polygonal because of the assembly of a plurality ofstraight cast or molded sections. In addition, inlet pipe 18 can belocated on the opposite side of baffle plate 20 from that shown in FIG.2 in which case the flow directions are reversed as compared to thedirectional arrows of FIG. 2. In either event, the flow via 26 iscontrollable by a plug insertable into and removable from each half ofopening 26 so that in the arrangement shown in FIG. 2 fiow proceeds via26 on the nearer side of bafile 20 and when inlet pipe 18 is in itsalternative position opposite flow occurs. Secondary discharge may bearranged from a pipe leading to another unit or location whereconditions such as volume and rate of flow require.

It has been found that sanitary drainage systems according to thepresent invention are easily and rapidly manufactured, transported andinstalled and meet all local laws and regulations.

What is claimed is:

1. A sanitary drainage system comprising a leaching pool defined by acircular or polygonal wall having efiluent openings therethrough, a domeatop said 'wall and having an opening in its upper portion, a closureover said opening, a Fiberglas septic tank having its wall extendingupwardly and inwardly along the dome inner surface and part way downinto said leaching pool and supported from the upper edge of said wallbeing held between the leaching pool wall top and the dome bottom andconverging therefrom downwardly and inwardly toward the center of thepool interior leaving a space between the septic tank and the leachingpool wall and configured to provide a hollow access shaft in verticalregistry with the dome opening, an inner cover on the upper end of theaccess shaft, inlet means passing through said dome at the upper end ofthe tank wall and outlet means in said tank at the upper end of the poolwall communicating with the interior of the access shaft for directingsewage into said pool.

2. A sanitary drainage system according to claim 1, wherein the septictank is generally hemi-spherical in ver tical medial section.

3. A sanitary drainage system according to claim 1, wherein the septictank is of somewhat flattened polygonal shape in vertical medialsection.

4. A sanitary drainage system according to claim 1, wherein the septictank is provided with an aperturcd, diametrically disposed bafile plateterminating below the dome top at the level of the inlet means andproviding a space between the bafiie and the top of the dome.

5. A sanitary drainage system according to claim 1, wherein theleaching, pool wall has efliuent openings throughout its height formedby superimposed trapezoidal rings and efliuent in the leaching pool hasaccess to all the effluent openings including those in the space betweenthe tank and the pool wall.

' 4 References Cited UNITED STATES PATENTS 3,240,343 3/ 1966 Werner210-532 X 3,097,166 7/1963 Monson 210- 3,501,007 3/1970 Davis 61-112,796,176 6/1957 Monson 210-261 3,662,918 5/1972 Crawford et al 210-53253,630,370 12/1971 'Guina 210-170 THEODORE A. GRANGER, Primary ExaminerUS. Cl. X.R. 210-532

